http://www.amazon.com/gp/aw/d/B000260408/ref=mp_s_a_1_4?qid=1398660477&s.... I have been using prime for over 2 years during my water changes and have not run in any problems so far. So I decided to save some money by ordering a 2L bottle from amazon received today. I noticed the container design is different. The front has english and spanish. The back has english, french, spanish, and portugese. Does anyone know if this is a prime knockoff? I got it for around $41with tax and free shipping. Attached are 2 pics.